Low-limit valve for gas-holders.



v L. SHAW. LOW LIMIT VALVE FOR GAS HOLDERS. APPLICATION FILED MAY 26,1909.

Patented-Dec. 7, 1909.

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I I I I 1 l INVENTOR LEONARD SHAW, OF CHICAGO, ILLINOIS.

LOW-LIMIT VALVE FOR GAS-HOLDERS.

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Specification of Letters Patent.

Patented Dec. '7, 196%.

Application filed May 26, 1909. Serial No. 498,516.

To all whom it may concern:

Be it known that I, LEONARD SHAW, of Chicago, in the county of Cook andState of Illinois, have invented a new and useful Improvement inLow-Limit Valves for Gas- Holders, of which the following is a full,clear, and exact description, reference being had to the accompanyingdrawing, forming part of this specification.

My invention relates to an improvement in gas holders, which are usedfor supplying gas to engines etc.

The object of my invention is to provide a cheap and ei'licient valvewhich will close the outlet from the gas holder when the hell or tank ofthe holder is emptied to a predetermined low limit, and thereby pre ventthe collapse of the bell which might be caused by the suction of a gasengine forming a partial vacuum in said holder.

The precise nature of my invention will be best understood by referenceto the accompanying drawing which will now be described, it beingpremised, however, that various changes can be made in the details ofconstruction and arrangement of parts without departing from the spiritand scope of my invention as defined in the claims.

In the accompanying drawing, I have shown a vertical section through agas holder showing one form of my improved valve attached, and in whichthe numeral 2 designates the body or stationary member of the holder and3 the movable tank or bell.

l is a gas inlet pipe and 5 is a gas outlet pipe. Both of these pipesextend to a point slightly above the level of the water in the bodyportion 2 which form the usual seal for the tank.

The upper end of the outlet pipe 5 is provided with a flange 6, andattached to the bell or tank 3 is a disk valve 7 having a small orificeextending through said valve. his valve may be attached by any suitableflexible connection such as a chain or coupler. As shown in the figure,this valve is suspended at an angle so that when the bell 3 is lowered asufficient distance to seat the valve on the flange, that portion of thevalve which is held by the longest chain will first be seated on theflange and as soon as the valve is lowered a sufficient distance toallow the side of the valve which is suspended by means of a short chainto be seated, the further escape of gas into the i pipe 5 is shut 0E. Assoon as gas is-admitted through the pipe A in a sufiicient quantity toraise the dome 3, it will first raise the side of the valve 7 which isheld by means of a short chain thereby equaliz ing the pressure in theoutlet pipe 5, and overcome the pressure on the top of the valve.

The advantages of my invention result from the provision of a valvewhich will automatically close the gas outlet when the bell has beenlowered to a predetermined point thereby overcoming the danger offorming a partial vacuum in the holder which is caused by the suction ofthe engine.

It will readily be understood by those familiar to the art that thepartial vacuum formed in the retainer places the holder in danger fromcollapse due to the atmospheric pressure on the outside of the tank,which danger is entirely eliminated if the outlet is closed when thebell has been lowered to a predetermined point.

I claim:

1. A gas holder having a movable bell which is water sealed at its lowerend, a gas inlet, a gas outlet above the water seal, and a valvesupported from the bell and at an angle with relation to the top of theoutlet pipe for closing the outlet pipe when the said bell reaches apredetermined level; substantially as described.

2. A gas holder having a movable bell which is water sealed at its lowerend, a gas inlet, a gas outlet above the water seal, a valve seat on theend of said outlet pipe, and a valve for closing the outlet suspendedfrom the top of the bell and at an angle with relation to said seat;substantially as described.

3. A gas holder having a movable bell which is water sealed at its lowerend, a gas inlet, a gas outlet above the water seal, a valve seat on theupper end of the outlet pipe and a valve connected to the bell atanangle to said seat by means of flexible connections and arranged to seaton the seat and close the outlet when the bell has reached apredetermined level; substantially as described.

In testimony whereof, I have hereunto set my hand.

LEONARD SHAWV. Witnesses JOHN WVIEOHERT,

A. A. W'ILsoN.

